A strategy to enhance soil quality and soil organic carbon stock in abandoned lands: Pasture regeneration through shrub clearing

IF 3.6 2区 农林科学 Q2 ENVIRONMENTAL SCIENCES
Melani Cortijos-López, Pedro Sánchez-Navarrete, Inés de la Parra-Muñoz, Teodoro Lasanta, Estela Nadal-Romero
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Abstract

Farmland abandonment in Mediterranean mid-mountain areas can lead to the degradation or recovery of soil properties. Typically, after abandonment, fields are covered with shrubs, which hinders livestock grazing and constitutes high wildfire risk. To avoid these negative effects, shrubs are cleared in selected areas. The main objective of this study is to evaluate whether shrub clearing can improve soil quality and enhance carbon sequestration. A case study was conducted in the Leza Valley (La Rioja, Spain), examining five different land uses/management practices in both acid and alkaline soil environments. These included shrubland (control), three shrub clearing sites (managed <5, 15, and 25 years ago), and control pasture (reference). Soil replicates at different depths (0–40 cm) were collected, and physico-chemical properties were analysed. A theoretical map of potential shrub clearing areas was created, and the potential to accumulate carbon was evaluated. Results showed that shrub clearing increases soil organic carbon and nitrogen, specially in 25-year clearings. The increases were greater and significant on alkaline environments. The cartographical analysis reveals that 3388 ha can be still cleared in the Leza Valley, which could increase soil organic carbon accumulation by up to 31.6% in 25-year period. We propose shrub-clearing as a strategy for enhancing carbon sequestration in Mediterranean mountain areas.

Abstract Image

提高废弃土地土壤质量和土壤有机碳储量的战略:通过清除灌木实现牧场再生
地中海半山区的农田荒芜会导致土壤性质退化或恢复。通常情况下,弃耕后的农田会被灌木覆盖,阻碍牲畜放牧,并有很高的野火风险。为了避免这些负面影响,人们在选定的区域清除灌木。本研究的主要目的是评估灌木清除是否能改善土壤质量和提高碳固存。在莱萨山谷(西班牙拉里奥哈)进行了一项案例研究,考察了酸性和碱性土壤环境中五种不同的土地利用/管理方法。其中包括灌木林(对照)、三个灌木林清除点(5 年、15 年和 25 年前的管理)以及对照牧场(参考)。采集了不同深度(0-40 厘米)的土壤重复样本,并对其物理化学性质进行了分析。绘制了潜在灌木清除区域的理论地图,并对积碳潜力进行了评估。结果表明,灌木清除增加了土壤有机碳和氮,特别是在 25 年的清除区。在碱性环境中,增加的幅度更大、更明显。地图分析显示,勒萨河谷仍有 3388 公顷的土地可以清除灌木,在 25 年的清除期内,土壤有机碳积累可增加 31.6%。我们建议将灌木清理作为提高地中海山区碳固存的一种策略。
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来源期刊
Land Degradation & Development
Land Degradation & Development 农林科学-环境科学
CiteScore
7.70
自引率
8.50%
发文量
379
审稿时长
5.5 months
期刊介绍: Land Degradation & Development is an international journal which seeks to promote rational study of the recognition, monitoring, control and rehabilitation of degradation in terrestrial environments. The journal focuses on: - what land degradation is; - what causes land degradation; - the impacts of land degradation - the scale of land degradation; - the history, current status or future trends of land degradation; - avoidance, mitigation and control of land degradation; - remedial actions to rehabilitate or restore degraded land; - sustainable land management.
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